Half to  frank green



(No Model.)

B. G. HAZARD.

CAN.

Patented Mar. 31, 1885.

n u I 1 N. PETERS. Phow-Lllhugmphen wlsmwm D. c,

UNITED STATES PATENT OF ICE.

EDWARD O. HAZARD, OF SHREWSBURY, NEW JERSEY, ASSIGNOR OF ONE- HALF TOFRANK GREEN, OF NEWV YORK, N. Y.

CAN.

SPECIFICATION forming part of Letters Patent No. 314,839, dated March31, 1885.

Application filed December 6, 1884. (No model.)

To all whom it may concern:

Be it known that I, EDWARD O. HAZARD, a citizen of the United States,residing at Shrewsbury, in the county of Monmouth and Stateof NewJersey, have invented certain new and useful Improvements in Cans, ofwhich the following is a full, clear, and exact description.

This invention relates to certain improvements in caps for cans, theparticular object being to produce a can adapted to be hermeticallysealed without contaminating the contents.

It is well known to canners of vegetables that during the process ofsoldering caps on cans the contents are apt to be more or lessinjuriously affected by contact with the vapors generated by thesoldering operation. This is particularly true of canned corn, and manyexperiments have been made to obviate this difficulty. In my experience,which has extended over a period of twenty years, dur-' ing which time Ihave prepared and sold many thousand cans of vegetables of differentkinds, I have met with much inconvenience and loss from this causealone; hence to prevent damage to the goods during the soldering processI have devised my present invention, which consists in a can providedwith two caps,one above the other, so arranged that the lower 0 cap toclose the mouth of the can will be held in place by contact of the uppercap, which latter may be soldered, sweated, or otherwise secured to thecan -top to hermetically seal the can without liability of injury to thegoods,

3 5 as hereinafter particularly set forth and claimed.

In the accompanying drawings, in the several figures of which like partsare designated by similar letters of reference, Figure 1 is a 40 centralvertical section through a portion of a can embodying my improvements.Fig. 2 is a similar view of a modified form. Figs. 3 and 4.- arerespectively a cross-section and a plan view of the outer cap, and Figs.5 and 6 similar views of the inner cap.

a is the can, and b the can-top, united at c by a lapped and solderedjoint in the usual manner. This can-top is provided with a depression orgroove, (1, a central opening or mouth, e, the metal at the edge of thisopening being upset so as to form a depression or groove, f, and a lipor flange, g.

A designates a cap adapted to fit in the groove (1, and B a smaller capadapted to fit in the groove f. These caps are both concavoconvex, withnearly fiat edges or rims. As usually made, cans for these purposes arecoinposed of all the parts enumerated excepting the cap A and depressionor groove d. Such cans are sealed by soldering the cap B in the groovef, which, as usually done, consists in first wiping the joint with asuitable acid and then melting or flowing solder in the groove, and thisis usually done while the contents of the can are hot and steaming Thissteam from the can naturally raises the cap, and unless the workmen arevery careful and hold the cap rigidly to its seat in the groove thevapors which are generated as the solder is melted on the metalpreviously wiped with 3 acid will enter the can between the cap and theflange g, discoloring the contents of the can under the cap, and thusdamaging the goods. To prevent this I employ the cap A, which, as shown,is made large enough to cover the cap B and fit in the groove d, and isunited to the can-top to hermetically seal the can by being soldered orsweated to the same in said groove d.

As shown in Fig. 1 of the drawings, the cap B is held in place by thecap A, which bears against it.

In the modified construction shown in Fig. 2, the groove f and flange gare omitted, and the metal at this point is crimped, as shown at h, toform a recess into which the edge of the cap B must be forced by thefollower or clamp of the can-soldering apparatus; but in bothconstructions thesoldering is done a sufficient distance from the mouthof the can to 0 preclude damage to the contents. Each cap will of coursehave a small opening, t j, in it to serve as a vent during theprocessing, and the opening in the outer cap will be closed by solder inthe usual manner after said cap 5 has been soldered in place.

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. The combination, with a can-top, of the outer sealed cap, A, andthe inner cap, B, se- :00

cured in place over the mouth of the can by the outer cap, substantiallyas set forth.

2. A can for the purposes described having a top provided with a mouthand depressions or grooves adjacent thereto, in combination With thevented caps A B, as set forth.

3. A can for the purposes described having the metal at its centralopening or mouth crimped to form a recess, combined with an inner cap toclose said opening and an outer 1o cap soldered to the can-top, bothcaps having Vents, substantially as specified.

In testimony whereof I have hereunto set my hand this 5th dayofDeoember, A. D. 1884.

EDWARD O. HAZARD. Witnesses:

ARTHUR G. WEBB, ERNEST C. WEBB.

